描述
模块式的PLC是按功能分成若干模块，如CPU模块、输入模块、输出模块、电源模块等等。大型机的模块功能更单一一些，因而模块的种类也相对多些。这也可说是趋势。目前一些中型机，其模块的功能也趋于单一，种类也在增乡。如同样OMRON公司C20系列PLC，H机的CPU单元就含有电源，而Ha机则把电源分出，有单独的电源模块。
National Instruments Lab-PC 180835-01 Computer Board
NATIONAL INSTRUMENTS SCXI-1162HV 32 CHANNEL DIGITAL I/P
SCB100 and NATIONAL Instruments PCI DIO96 + DIO CARD
National Instruments PXI-2503 Multiplexer/Matrix Switch
National Instruments SCXI 1140 8 CH Sample Hold AMP
National Instruments NI 5½-Digit Multim PCI 4060 Tested
National Instruments NI GPIB SCSI-A Interface
National Instruments Type X2 GPIB Cable 763061-02 NEW
National Instruments, FP-PWM 520 Module, 8Ch.,PWM Outpu
NI NATIONAL INSTRUMENTS PCI-6071E 184411C-01
Lot NI National Instruments NB-GPIB Lab-NB MIO Cards
NATIONAL INSTRUMENTS CFP-DO-401 SOURCING OUTPUT 16-CH
